Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa0caf40a06eb92…

MALICIOUS

PDF

111.7 KB Created: 2021-04-02 00:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 32a7f7c09ea6f3c2708a7c62aad841de SHA-1: 6188fc540fff8e6f9c4428cd1e27dfd072f7f08e SHA-256: 4aa0caf40a06eb927b543b5253b3feac0a12eed7d7cab58c2fb9baf7fc17c76d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/award?keyword=basic+and+bedside+electrocardiography+pdf+download PDF link annotation
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/cf74404789d.pdfIn PDF document text
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/6242585.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/webesewati-wiludofatezawir.pdfIn PDF document text
    • https://vaxawoma.weebly.com/uploads/1/3/4/7/134745114/tovemilememuxi.pdfIn PDF document text
    • http://it50disconto.info/bhavani_sannidhi_naa_songsgiqqv.pdfIn PDF document text
    • http://jiwimejikigigu.mywebcommunity.org/totiluxuzunokupifi.pdfIn PDF document text
    • http://form-copyrightservices.com/honda_2hp_outboard_shop_manualctfap.pdfIn PDF document text
    • http://ttop-shop.com/bullet_bandi_song_videoifny3.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/house_on_mango_street_map_project.pdfIn PDF document text
    • http://bred-enligne.com/nadakuxils4ys.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601a5d30bab4c.pdfIn PDF document text
    • http://zuberisuxivaki.scienceontheweb.net/livre_pour_apprendre_l_anglais_gratuit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fec839b5d48b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483854/normal_605f526345ec5.pdfIn PDF document text
    • http://pubgmobiie.com/will_beats_be_on_sale_for_black_fridayeeamb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/jadual_caruman_kwsp_pekerja_dan_majikan.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/wahl_hair_clipper_guide_comb_10.pdfIn PDF document text
    • http://tokezaja.epizy.com/sazofakave.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/canoscan_4400f_software_free.pdfIn PDF document text
    • http://lofekelatek.epizy.com/lodoxotitofukojoli.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA0 5800 bytes
SHA-256: 040a51cc511cdfa5dbb387df9f3528526923861f0e00933b21b8f8d34ad1fbf5
font_01_sfnt_off0001636e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636E 24924 bytes
SHA-256: 3b32027b92752b44b75197ebc0e47338f5b0bdefdb18be478cd611ca0dacf630
font_02_sfnt_off00019990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19990 16076 bytes
SHA-256: 1e6e3dc03332cc53d77147a068cf99156e57e0e2d49a13f8ec5e783694f6e605

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